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Wednesday, 28 May 2008


YO PEOPLE.

its MA KE HERE TO POST.

i've done the research already!

but then i dont want to come here and copy paste everything,

so just talk to me online if you want the URLs OKAY!

BYEBYE:D

;8:12:00 pm


Sunday, 25 May 2008


here's more information that we can use for our project!
i think using it for the introduction would be good(:

What are water dams?
A water dam is a barrier that divides waters.
Dams generally serve the primary purpose of retaining water, while other structures such as floodgates, levees, and dikes are used to prevent water flow into specific land regions.
The tallest dam in the world is the 300 meter high Nurek Dam in Tajikistan.

Three Gorges Dam
The three Gorges dam, therefore, is the China Yangtze Three Gorges Project (TGP) as one of the biggest hydropower-complex project in the world.
It ranks as the key project for improvement and development of Yangtze River.
The dam is located in the areas of Xilingxia gorge, one of the three gorges of the river, which will control a drainage area of 1 million km 2 , with an average annual runoff of 451 billion m3 .
The open valley at the dam site, with hard and complete granite as the bedrock, has provided the favorable topographical and geological conditions for dam construction.

As everybody here knows, energy cannot be created or destroyed, but it can be converted into other forms of energy.

Purpose of the dams in china
The Three Gorges Dam was built for Flood Control.
Floodgates are adjustable gates used to control water flow in reservoir, river, stream, or levee systems.
They may be designed to set spillway crest heights in dams, to adjust flow rates in sluices and canals, or they may be designed to stop water flow entirely as part of a levee or storm surge system.
In the case of flood bypass systems, floodgates sometimes are also used to lower the water levels in a main river or canal channels by allowing more water to flow into a flood bypass or detention basin when the main river or canal is approaching a flood stage.
Flood control standard of the middle and lower reaches of the Yangtze, especially the Jingjiang Section, will be largely upgraded from the present level of preventing under-10-year floods to that of preventing 100-year floods. So 15 million people and 1.5 million hectares of farmland in the Jianghan Plain are relieved from flood threats, and devastating plagues of massive death caused by big floods are avoided.
The second reason is for Power Generation.
The river water will generate electricity in the hydropower stations.
The profits are considerable. With the Three Gorges Hydropower Plant (TGHP) containing twenty-six turbine-generator units, each with installed capacity of 700MW, not including the six more 700MW units in the Right Bank Underground Powerhouse under construction, the anticipated annual electricity generation is 84.6 billion kilowatt hours.
It will be the number one in the world and will play an important role in the development of the economy and reduction of environmental pollution.
This is linked to Tourism as the Three Gorges Dam Project will be the largest water conservancy in the world combined with the world-renowned natural beauty.
It will become the "hottest" tourist and press attraction in recent years.
Lastly, the 600km long waterway from Yichang to Chongqing will aid in Navigation.
This waterway will be improved, making it possible for 10,000 tons of shipping to sail directly upstream to Chongqing.
The river transport will be improved from 10 million to 50 million tons per year and the costs reduced by 35-37 percent.
After the adjustment to the reservoir, navigation conditions both upstream and downstream on the Yangtze River will have been greatly improved in those seasons when water levels have been low.

there(:

;2:26:00 am


Saturday, 24 May 2008


Hello people!;D
here's some info on how the dam works based on hydro energy!

How it works
A dam is built to trap water, usually in a valley where there is an existing lake.
Water is allowed to flow through tunnels in the dam, to turn
turbines and thus drive generators.
Notice that the dam is much thicker at the bottom than at the top, because the pressure of the water increases with depth.

Hydro-electric power stations can produce a great deal of power very cheaply.
When it was first built, the huge "Hoover Dam", on the Colorado river, supplied much of the electricity for the city of Las Vegas; however now Las Vegas has grown so much, the city gets most of its energy from other sources.


There's a good explanation of how hydro power works at www.fwee.org.
Although there are many suitable sites around the world, hydro-electric dams are very expensive to build. However, once the station is built, the water comes free of charge, and there is no waste or pollution.


The Sun evaporates water from the sea and lakes, which forms clouds and falls as rain in the mountains, keeping the dam supplied with water.

More details
Gravitational potential energy is stored in the water above the dam. Because of the great height of the water, it will arrive at the
turbines at high pressure, which means that we can extract a great deal of energy from it. The water then flows away downriver as normal.
In mountainous countries such as Switzerland and New Zealand, hydro-electric power provides more than half of the country's energy needs.


An alternative is to build the station next to a fast-flowing river. However with this arrangement the flow of the water cannot be controlled, and water cannot be stored for later use.
See also:
www.fuelfromthewater.com

Advantages
Once the dam is built, the energy is virtually free.
No waste or pollution produced.
Much more reliable than wind, solar or wave power.
Water can be stored above the dam ready to cope with peaks in demand.
Hydro-electric power stations can increase to full power very quickly, unlike other power stations.
Electricity can be generated constantly.

thereeee(:
hope this will help in our SIA! O:
since it's about the whatever whatever china dam, LOL.

;8:59:00 am


Monday, 19 May 2008


okay so righttt.
here's a summary of what our meeting was about.

1. ma ke, you're in charge of mainly research!
make sure you go find relavant information constantly kay!xD
like. hmmm. we decided on once every 2 weeks right?

2. wandong, you're finding nice pictures of the dam!
and water running. LOL.
for our physics poster(:

3. zhi-yi! design the posterrrr. O:

4. im here to make sure you all are on time! HAHHA.
and to keep this blog alive luh, basically.
and do the physics presentation. o.o

datelines:
try to finish up this blog by june hols,
poster by week 2 of term 3,
and presentation materials by week 5(:

its do-able people!
we give ourselves too much time actually, HAHAH.
okay jiayouuu<3

;12:37:00 am


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to threeohseven's physics SIA blog(:

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:D studying in 3ohseven.
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